HISTORY OF THE ATOM

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Across
  1. 4. Processes in which atoms rearrange but are not created or destroyed
  2. 5. Ability for experiments to be repeated with similar results
  3. 6. Extent to which results accurately support a conclusion
  4. 10. Total number of protons and neutrons in an atom
  5. 13. Scientist who proposed the first modern atomic theory
  6. 15. Positively charged particles found in the nucleus
  7. 17. Dalton believed atoms could not be divided into smaller particles
  8. 22. Dense center of the atom discovered after Dalton’s theory
  9. 24. Information gathered using the senses or instruments
  10. 25. Substances formed when atoms of different elements combine
  11. 26. Representation used to explain or visualize scientific ideas
  12. 27. Negatively charged particles that disproved atoms were indivisible
  13. 29. Proposed explanation that can be tested by experiment
  14. 31. Ability of a theory to forecast outcomes of experiments
  15. 32. Able to be investigated through experiments or observation
  16. 33. Substance made of only one type of atom
  17. 34. Agreement of results with repeated testing and observations
  18. 35. Smaller particles later discovered within atoms
  19. 36. Group of atoms chemically bonded together
Down
  1. 1. Reliable observations and data that support a scientific explanation
  2. 2. Neutral particles discovered that exist in the nucleus
  3. 3. Principle stating matter cannot be created or destroyed in chemical reactions
  4. 7. Law stating compounds form in fixed ratios of atoms
  5. 8. Measurements or results collected during scientific investigations
  6. 9. Atoms of the same element with different masses due to different neutrons
  7. 11. Number of protons defining an element
  8. 12. Changes made to Dalton’s theory after new discoveries
  9. 14. Modern understanding that atoms can be split into smaller particles
  10. 16. Evaluation of scientific work by other experts before acceptance
  11. 18. Dalton proposed atoms of the same element were this
  12. 19. Tiny indivisible particles that make up matter according to Dalton
  13. 20. Well-supported explanation based on evidence and repeated testing
  14. 21. Able to be proven wrong through evidence
  15. 23. Controlled test used to support or challenge a theory
  16. 28. Degree to which results are consistent when repeated
  17. 30. Process of modifying a theory when new evidence is discovered